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Q: 

how to have the right sum of type Time with sql

Possible Duplicate:
calculate a sum of type time using sql

I have 2 columns called TimeFrom and TimeUntill. The duration is calculated in TimeSpent.

The values in the column TimeFrom look like this: 10:00:00
The values in the column TimeUntill look like this: 12:00:00
The TimeSpent column would then have the value: 02:00:00.

My goal is to calculate the sum of timeSpent.

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